Full burner assembly



Aug. 4, 1964 s. c. WHITNEY, JR.. ETAL FULL BURNER ASSEMBLY R 1 m] w Y, Rm WE o m m T .IM M a 1 WE m a H N @K m w 3 6 w. a m J d R 1 F g- 4, 1964G. c. WHITNEY, JR., ETAL FULL BURNER ASSEMBLY 4 Sheets-Sheet 2 FiledJan. a, less INVENTOR GILBERT C. h fl/r/ve'n-JR.

KENNETH E, LEE- BY ATTORNEY g- 4, 1964 G. c. WHITNEY, JR., ETAL3,143,089

FULL BURNER ASSEMBLY Filed Jan. 8, 1963 4 Sheets-Sheet 3 INVEN'IORGILBERT CI WHITNEY, 7?.

BY Ham/57w 5. 5

ATTORNEY United States Patent Office 3,143,089 Patented Aug. 4, 19643,143,089 FULL BURNER ASSEMBLY Gilbert C. Whitney, Jr., and Kenneth E.Lee, Dansville, N.Y., assignors to Foster Wheeler Corporation, New York,N.Y., a corporation of New York Filed Jan. 8, 1963, Ser. No. 253,781 11Claims. (Cl. 110-28) This invention relates to fuel burners and moreparticularly to fuel burner assemblies capable of controlling thedirection of the flame from the nozzles of the burners.

This application is a continuation-in-part application of United StatesPatent applications, Serial Nos. 728,671 (now abandoned) and 847,596,filed April 15, 1958, and October 20, 1959, respectively.

Heretofore, one means for achieving control of the direction of flow offuel from the burner nozzle, and hence, the direction of the burnerflame into a combustion chamber, has been to provide burners withcomplex air register assemblies and actuating mechanisms for adjustmentof the vanes or doors of the air registers whereby control of secondaryair flow to the area of the burner nozzle outlet is effected. Anotherknown means for achieving control of the direction of flow of fueldischarged from the burner nozzle, has been by providing the burnernozzle with a pivotal burner tip and a relatively complex burner tipactuating mechanism. The disadvantage of the foregoing burner structuresis the complexity and the relatively high cost of fabrication and, inthe case of the pivotal burner tip structure, control of flame directioncan only be effected in one plane. A further disadvantage of presentburner assemblies is the relatively large pressure drop in secondary airin flowing between the windbox and the burner nozzle outlet whichnecessitates the use of relatively large blowers to obtain a relativelyhigh pressure in the windbox to compensate for the expected pressuredrop at the burner nozzle outlet.

Accordingly, it is an object of the present invention to provide arelatively simple and inexpensive burner assembly wherein control of thedirection of the flame burst therefrom can be achieved in a plurality ofplanes. Another object of this invention is to provide a burnerstructure wherein the pressure drop of secondary air through the burnerstructure is greatly minimized. A further object is to provide a burnerstructure having improved secondary air distribution peripherally of theburner nozzle fuel outlet whereby improved burner flame characteristicsare achieved.

The present invention contemplates a novel burner assembly comprising ahousing for receiving combustion air from a suitable source thereof, thehousing having an outlet opening therein and a burner nozzle projectingthrough the outlet opening. The burner nozzle is connected at one end toreceive fuel from a suitable source thereof and is provided with anoutlet at the opposite end for discharging fuel for combustion. A firstring-shaped baffle or skirt is disposed in superimposed relationshipover the burner nozzle and is secured to the nozzle adjacent the outlet.The baffle extends from the point of connection with the burner nozzle,through the outlet of the housing, and into the interior of the latter.A second ring-shaped baflie of larger dimensions than said firstringshaped baffle is disposed in superimposed coaxial relationship tosaid first bafiie. The second ring-shaped baflie is disposed to extendfrom a point adjacent the burner nozzle outlet into the housing outlet.Means are provided for supporting the second baflie in spacedrelationship to said first bafile so that an annular combustion airpassageway is defined between the baffles which pas sageway communicatesat one end with the interior of the housing to receive combustion airand at the other end communicates with the outlet of the burner nozzleto discharge combustion air peripherally of the nozzle outlet. A secondmeans is provided for supporting and moving the second bafile relativeto the first bafile to vary the axis of the flow of combustion air withrespect to the longitudinal axis of the burner nozzle and flow of thefuel from the burner nozzle and thereby control the posi tion of theburner flame produced by the combustion of fuel discharged from theburner nozzle.

As an embodiment of the invention, the secondary air passageway may bedefined by the outer or second ringshaped baffle and the burner nozzle,the first ring-shaped baflle or skirt being omitted. Preferably theburner nozzle has a frusto-conical configuration, so that thepassageway, as with the embodiment described above, has a long radiuscurvature extending from a large circumference end in communication witha source of combustion air and terminating at a small circumference endin communication with the discharge end of the burner nozzle.

Although this embodiment may result in a slightly increased pressuredrop of secondary air, over the first described embodiment, it is foundthat the pressure drop is significantly less than with conventionalassemblies, and further that a much improved distribution of secondaryair peripherally of the burner nozzle discharge end is achieved, withimproved burner flame characteristics and control, as with theembodiment described above.

The invention will be more fully understood from the following detaileddescription thereof when considered in connection with the accompanyingdrawings, in which:

FIG. 1 is a sectional view in elevation of a fuel burner assemblyaccording to the present invention;

FIG. 2 is an end view of the fuel burner assembly of the presentinvention as viewed from the left in FIG. 1, with parts broken away forillustration purposes;

FIGURE 3 is a fragmentary view in perspective showing the manner ofsupporting the burner assembly;

FIG. 4 is a sectional view taken substantially along line 44 of FIG. 1;

FIG. 5 is an enlarged fragmentary view of the support and adjustmentassembly according to this invention; and

FIG. 6 is a view in section taken substantially along line 6-6 of FIG.1.

Referring now to the drawings, 10 generally designates the burnerassembly according to the invention for combustion of pulverized fuel.Burner assembly 10 is disposed exteriorly of a wall 11 of a combustionchamber (not shown) adjacent a burner port 12 provided in wall 11. Theburner assembly 10 comprises a housing or windbox 13 having a top wall14, bottom wall 15, opposite side walls 16 and 17 (FIG. 2), a rear wall18 and a front wall 19, which walls are joined together to form afluid-tight enclosure or plenum chamber 20. An air duct 21 is connectedat one end to the bottom Wall 15 of windbox 13 and at the other end to asource of second ary air under pressure (not shown), such as a fan. Flowof secondary air into chamber 20 is controlled by a damper 22 disposedwithin air duct 21. Front wall 19 is provided with an outlet opening 23therein.

A pulverized fuel burner 24, comprising a burner nozzle or injector 25and a volute entrance section 26, is disposed and suitably supported inwindbox 13 so that burner nozzle 25 extends horizontally through windboxoutlet opening 23 to a point adjacent burner port 12. Burner nozzle 25may be provided with spaced helical ribs on the interior surface thereofor straight ribs as disclosed in US. patent application Serial No.446,532, filed July 29, 1954 now Patent No. 2,912,942 and a suitableignitor (not shown) coaxially arranged therein. The volute section 26 isconnected to a pulverized fuel and air feed pipe 27 which extendsthrough top wall 14 of windbox 13 and is connected to a suitable sourceof pulverized fuel and air (not shown). The mixture of pulverized fueland air is fed to the volute section 25 by feed pipe 27, and thenceflows through burner nozzle 25, and is discharged from the burner nozzleoutlet 28 into burner port 12. Secondary air supply necessary to supportefficient combustion of the fuel is delivered to the burner nozzleoutlet 28, as hereinafter described.

An open-ended bell-shaped skirt or baiile 29 is disposed over and incoaxial relationship with burner nozzle 25 and is suitably secured alongits smaller diameter end, as by welding at 30, to burner nozzle 25adjacent outlet 28 of the latter. Baffle 29 is dimensioned so that itextends from its connection with the nozzle rearwardly, through outletopening 23 in front of wall 19 of windbox 13, to a point adjacent volutesection 26 and feed pipe 27. A second open-ended bell-shaped baflle 31of substantially the same configuration as baflle 29, but ofsubstantially larger dimensions than bafiie 29, is disposed insuperimposed coaxial relationship with bathe 29 and nozzle 25. Bafile 31is dimensioned and positioned so that its smaller diameter end portion32 projects into burner port 12 and extends rearwardly from end portion32, through outlet opening 23 in front wall 19 of windbox 13, to a pointwithin plenum chamber 20 adjacent the larger end of baflle 29. Baflle 31is supported in spaced relationship to baffle 29 and nozzle by supportand adjustment means, hereinafter described. Ballies 29 and 31 definetherebetween a secondary air passageway 33 which, as in longitudinalsection has a long radius curvature. Passageway 33 communicates at oneend with the interior of windbox 13 to receive secondary air from plenumchamber 20 and at the opposite end communicates with the burner nozzleoutlet 28 to deliver secondary air around the periphery of nozzle outlet28.

Bafile 29 may be provided with a plurality of spaced vanes 34, as bestshown in FIGS. 1 and 6, disposed angularly around the outer surface ofthe balfle to impart rotational movement to the secondary air flowingthrough passageway 33. It has been found that imparting a small rotarymovement to the flow of secondary air in the same direction as therotational movement of the pulverized fuel and air mixture provides forthe maintenance of stable ignition of the fuel.

To support baffle 31 in spaced relationship with baflie 29 and nozzle25, bafile 31 is provided with four radially extending arms 35, 36, 37and 38 which are spaced 90 from each other around the periphery ofbaffie 31. Arms 35, 36, 37 and 38 extend from bafile 31 to a pointslightly beyond the plane of top wall 19, side walls 16 and 17 andbottom wall 15 of windbox 13. The distal end portions of arms 35, 36, 37and 38 are each provided I with a hole 39 which is adapted forconnection to support and adjustment assemblies 40, 41, 42 and 43,respectively, hereinafter more fully described.

Burner assembly 10 is secured to combustion chamber wall 11, adjacentburner port 12, by two spaced parallel I-beams 44 and 45 which areconnected to and extend horizontally between two vertically extendingI-beams or buckstays 46 and 47 (FIGS. 1 and 2). As best shown in FIGS. 1and 3, windbox 13 is secured at rear wall 18 to I-beams 44 and 45 in asuitable manner, as by brackets riveted to the beams, so that therespective legs 48 and 49 of the I-beams 44 and 45 extend, respectively,beyond the plane of top wall 14 and bottom wall 15. The opposite legs48A and 49A of the respective I-beams 44 and 45 are also secured to ametallic ring 50 which lines the peripheral surface of a recess 51 inthe exterior surface of the combustion chamber wall 11.

To seal off the space between combustion wall 11 and the windbox 13 fromthe air surrounding the fuel burner assembly 10, the spaces betweenI-beams 44, 45 and 47 and front wall 19 of the Windbox is closed by anL-shaped sealing plate 47A which extends between and is welded toI-beams 44 and 45 and to the outer leg of I-beam 47, as well as to frontwall 19 of windbox 13. A similar L-shaped sealing plate 46A, extendsbetween and is welded to I-beams 44 and 45 and outer leg of I-bearn 46,to close the space between I-beams 44, 45, 46 and front wall 19 of thewindbox (see FIGS. 1, 2 and 3). The space between I-beams 44, 45, and 47and the metallic ring 58 lining recess 51 of wall 11 is closed by aplate 59A which is disposed in abutment against the inner leg of I-beam47 and legs 48A and 49A of I-beams 44 and 45, respectively, to whichlegs plate A is welded. Plate 50A is provided with an arcuate-shapededge portion which abuts ring 50 and is welded thereto (see FIGS. 3 and6). A plate 563, similar to plate 50A is welded to I-beams 44, 45 and 46and to the metallic ring 50, in the same manner as plate 50A, to closeoff the space between I-beams 44, 45 and 46- and ring 50. L-shapedsealing plates 46A and 47A and plates 58A and 50B, seal oif the spacebetween windbox 13 and combustion chamber wall 11 from the surroundingair to thereby prevent secondary air leakage, through outlet 23 in frontwall 19 of the windbox, to the atmosphere.

Each of the support and adjustment assemblies comprise an actuating rod52 having a threaded end portion 53 and an opposite end portion threadedat 54. A sleeve is secured, as by welding, swaging, or the like, to eachof the rods to provide an enlarged body portion 55 adjacent threaded endportion 54. The end 56 of enlarged body portion 55 adjacent end portion54 is cut back on either side of a horizontal center line, the purposeof which will become apparent hereinafter. Each of the actuating rods 52is provided, as best shown in FIG. 1, with a slot or keyway 52A, thepurpose of which will be hereinafter explained.

Actuating rod 52 of support and adjustment assembly 40 is supportedabove and centrally of top wall 14 by a bearing plate 58 which issecured to top wall 14 midway between side walls 16 and 17, and by twoaligned holes 59 and 60 in the respective legs 48 and 48A of I-beam 44.Bearing plate 58 is provided with a hole 61 which is adapted to receivetherethrough threaded end portion 53 of actuating rod 52, while holes 59and 60 are adapted to receive therethrough the enlarged body portion 55of actuating rod 52. Holes 59 and 60 are so dimensioned that they aretightly embracing body portion 55 but not so tightly as to prevent axialmovement of the rod therethrough. To provide additional support for rod52, a sleeve member 62 is disposed over each of the holes 59 and 60 andis welded to the respective legs 48 and 48A of I-beams 44. Sleeve member62 is provided with a pin 62A which extends into keyway 52A of actuatingrod 52. Pin 62A and keyway 52A cooperate to prevent rotation of rod 52and allow axial movement of the latter. End portion 54 of actuating rod52 extends through hole 39 in arm 35 of bafiie 31, and the arm issecured to the actuating rod 52 by a retaining nut 63 which is turnedupon threaded end portion 54 of the rod. Nut 63 is provided with taperedinner surface 64 which is similar to the tapered end 56 of enlarged bodyportion 55 of actuating rod 52, so that an annular notch is definedbetween the latter and nut surface 64 having oppositely inclined faceswhich allow pivotal movement of arm 35 relative to actuating rod 52 (seeFIG. 5). A handwheel 65, having an integral flanged hub 66, is turnedupon threaded end portion 53 and is supported for rotation Within abearing socket member 67 which is secured to and forms a part of bearingplate 58.

To move actuating rod 52 axially within hole 61 of bearing plate 58 andholes 59 and 68 of I-beams 44, handwheel is rotated upon threaded endportion 53 of the rod thereby feeding the rod toward or away fromcombustion wall 11, depending upon the direction of rotation ofhandwheel 65.

Actuating rod 52 of support and adjustment assembly 41 is supported foraxial movement centrally of bottom wall 15 of wind-box 13, in the samemanner as actuating rod 52 of assembly 40, by a bearing plate 68,similar to hearing plate 58, and aligned holes 69 and 70 in therespective legs 49 and 49A of I beams 45. Rotation of rod 52 isprevented and axial movement thereof is allowed by a pin which extendsinto keyway 52A in the same manner as explained with respect to supportand adjustment assembly 40. Actuating rod 52 of assembly 41 is alsoprovided with a handwheel 71, similar to handwheel 65, and is connectedto arm 36 of baflle 31 by a retaining nut 72 turned upon threaded endportion 54 of rod 52 in the same manner as actuating rod 52 of assembly40 is connected to arm 35 of baffle 31.

Each of the support and adjustment assemblies 42 and 43 are supportedcentrally of and adjacent to side wall 16 and 17, respectively, bybearing plates 73 and 74 similar to hearing plates 58 and 68. As shownin FIG. 4, enlarged body portions 55 of actuating rods 52 of assemblies42 and 43 are supported in holes 75 (FIG. 1) and 76 (FIG. 4), whichholes are provided in L-shaped sealing plates 46A and 47A. Over each ofthe holes 75 and 76 is secured a sleeve 77 which is provided with a pin,to pin 62A which extends in keyways 52A in actuating rods 52, to preventrotation of the rods and to permit axial movement thereof. Actuatingrods 52 of support and adjustment assemblies 42 and 43 are connected,respectively, to arms 37 and 38 of baflle 31, in the same manner asactuating rods 52 of assemblies 46 and 41 are connected to arms 36 and37, by retaining nuts 78 and 79, respectively, similar to retaining nuts63 and 72. Actuating rods 52 of support and adjustment assemblies 42 and43 are each provided with handwheels 80 and 81, respectively, which aresupported for rotation within bearing plates 73 and 74, respectively.Axial movement of actuating rods 52 of assemblies 42 and 43 is effectedby turning handwheels 80 and 81 as aforedescribed with respect toactuating rods 52 of assemblies 40 and 41.

In operation of the aforedescribed burner assembly 10, pulversized fueland primary air mixture is fed to volute entrance section 26 by feedpipe 27. The mixture of pulverized fuel and primary air passes from thevolute entrance section into and through burner nozzle 25. The fuel isthen discharged from the burner nozzle outlet 28 into the combustionchamber (not shown) through burner port 12 in combustion chamber wall11. Simultaneously, with the flow of pulverized fuel and air through theburner nozzle 25, secondary air under pressure is supplied to plenumchamber 261 through air duct 21. Within plenum chamber 20, the secondaryair flows into annular air passageway 33 which is defined betweenbaflles 29 and 31. The secondary air flows through passageway 33 whereinrotary motion is imparted to the air stream by action of the angularlydisposed vanes 34. The air is then discharged peripherally of the burnernozzle outlet 28 into burner port 12. The pressure drop of the secondaryair flow through passageway 33 is relatively small by reason of the longradius curvature of the passageway which causes initial acceleration ofair around the large circumference of the passageway, the velocity ofthe air stream being maintained with little pressure drop through thepassageway. However, there is sufficient pressure drop to insure uniformdistribution of secondary air in plenum chamber 26 to achieve uniformperipheral distribution of ,air into annular passageway 33. By reason ofthe long radius nozzle configuration of passageway 33, a more uniformdistribution of air at the burner nozzle outlet 28 is achieved and,hence, improved flame character. The annular long radius nozzleconfiguration of passageway 33 also minimizes unnecessary andunsymmetrical air turbulence and therefore only a small degree ofmovement of balfle 31 relative to nozzle 25 is necessary to effect a.change in the direction of the flame. Further improved flame characterand stability of the flame is achieved by vanes 34 which impart rotationto the air stream through passageway 33 in the same direction as therotation of the primary air and fuel mixture passing through nozzle 25.

Change in the direction of flow of fuel from burner nozzle outlet 23,and thereby the direction of the flame in the combustion chamber, may beefiected by moving baflle 31 relative to baflle 29 and burner nozzle 25through adjustment of one or more of the actuating rods 52 of supportand adjustment assemblies 40, 41, 42 and 43 to cause the off-axialpositioning of baflle 31 relative to the axes of bafile 29 and nozzle25. As illustrated in FIG. 1, if it is desired to direct the flamedownwardly into the combustion chamber, handwheel 65 is rotated onthreaded end portion 53 of actuating rod 52 of assembly 40 to cause theactuating rod to move axially toward the combustion chamber wall 11 to aposition shown by the broken line, while handwheel 71 of assembly 41 isrotated to cause actuating rod 52 to move axially in a direction awayfrom wall 11. Movement of actuating rods 52 of assemblies 40 and 41carries arms 35 and 36 of baflie 31 respectively toward and away fromthe combus tion chamber wall 11 to the positions shown by the brokenlines thereby tilting baflie 31 so that baffle 31 within plenum chamber20 abuts baffle 29, as is also shown by the broken lines in FIG. 1. Withbaffle 31 positioned as shown in broken lines of FIG. 1, the axis ofbaffle 31 is changed so that the mass of secondary air flowing throughpassageway 33 enters the furnace along an axis which is at an angle withrepsect to the axis of the primary air and pulverized fuel flow mixturedischarging from nozzle 25 thereby causing the flame burst to assume anaxis or direction which is at a downward angle with respect to the axisof nozzle 25.

To direct the fuel stream and, therefore, the flame burst upwardly,handwheel 65 is turned so as to retract actuating rod 52 past theoriginal position shown in full lines, while handwheel 71 of support andadjustment assembly 41 is turned so as to move its actuating rod 52toward combustion chamber wall 11. Axial movement of the actuating rodscarries arm 36 toward wall 11 and arms 35 away from wall 11 therebytilting baflle 31 so that its axis extends upwardly relative to the axesof baflle 29 and burner nozzle 25. In this position, the axis of bafiie31 is changed so that the mass of secondary flowing through passageway33 enters the furnace along an axis which is at an upward angle withrespect to the axis of the primary air and fuel mixture discharging fromnozzle 25 thereby causing the flame burst to assume an axis or directionwhich is at an upward angle with respect to the axis of nozzle 25.

In the same manner as aforedescribed, the fuel and primary air streamdischarged from burner nozzle 25 may be directed in a horizontal planeto the right or left of the burner nozzle axis by effecting a tilting ofbaifle 31 relative to baflle 29 and burner nozzle 25 through turninghandwheels and 81 of support and adjustment assemblies 42 and 43.

If it is desired to direct the fuel and primary air stream in adirection lying in both a vertical and horizontal plane with respect tothe axis of burner nozzle 25, adjustment is effected of either actuatingrod 52 of assemblies 40 and 41, depending on whether it is desired todirect the flame above or below the axis of burner nozzle 25, andassemblies 42 or 43, depending on whether it is desired to direct theflame to the right or left of the axis of burner nozzle 25.

By relative adjustment of assemblies 40, 41, 42 and 43 baffle 31 may betilted in any direction with respect to baflle 29 andburner nozzle 25and to any degree between extreme positions thereof whereby precisedirectional control of the flame burst can be achieved.

It should be apparent that the above support and adjustment assemblieseffect a movement of the outer baflle 31 about an imaginary pivot pointapproximately located in the plane of the burner nozzle outlet and alongthe longitudinal axis of the nozzle to position the axis of the baflleat an angle relative to the burner nozzle axis. In this way control ofthe direction of the burner flame is achieved with optimum distributionof secondary air peripherally around the burner nozzle outlet. Inparticular, the dimensions of the passageway annularly about the nozzleare uniformly maintained, avoiding constricting the passageway in amanner adjacent the outlet to adversely affect flame characteristics.This is particularly important when it is realized that the flow rate ofthe secondary air is approximately 40 times by weight that of theprimary air flow.

It has been found that the angle of change of baflie 31 relative tonozzle 25 achieves an angle of change in the direction of the burnerflame which is substantially the same as that of the angle of changeofbaffle 31 and therefore only a small angular movement of ballle 31 isneeded to effect the same degree of flame direction that is obtained bya conventional pivotal burner tip.

It can be seen readily from the foregoing description that a novelburner assembly has been provided wherein directional control of theflame burst can be achieved through 360 around the axis of the burnernozzle without expensive or complicated structures. It is a burnerassembly wherein the pressure drop through the burner is greatly reducedso that windbox pressure need not be as high as in convenitonalintervene type burner assemblies.

It is to be understood that while the burner assembly of the presentinvention has been illustrated and described as adapted for burningpulverized fuel, the invention is not limited thereto. The invention isapplicable to burners constructed for burning gaseous fuel, liquid fuelsand the like, without departure from the spirit and scope of theinvention.

Although but one embodiment of the invention has been illustrated anddescribed in detail, it is to be exprcssly understood that the inventionis not limited thereto.

For example, the involute section need not be disposed within thewindbox but may be positioned outside of the rear Wall of the windboxwith the burner nozzle extending through the rear wall. In addition, thewindbox may be secured directly to the outer surface of the combustionchamber wall.

Further, referring to FIG. 1, it is evident that the bafile orbell-shaped skirt 29 may be omitted so that the passageway is defined bythe burner nozzle and the outer bell-shaped baffle 31. Preferably, theburner nozzle will have a frusto-conical configuration such that thesecondary air passageway extends, with, substantially, a large radiuscurvature, from a large circumference end in communication with a sourceof combustion air to a small circumference end in communication With thedischarge end of the burner nozzle. The outer baiile, pivoting about apoint located approximately in the plane of the burner nozzle outlet andalong the axis of the nozzle, effectively directs the combustion air andcontrols the direction of the burner flame. without constricting thepassageway around the burner nozzle outlet and with a uniformdistribution of secondary air and a uniform velocity pattern around thenozzle.

In certain installations, it may be desirable to position the burnernozzle as far away from radiation as is practical without impairing theoperation of the burner. In these cases, the pivot point for the bafllemay be slightly in front of the burner nozzle but along the axis of thenozzle, the important factor being that the baflle should be pivoted ina manner so that the velocity pattern around the burner remainssubstantially uniform. A uniform velocity in the annulus around thenozzle is essential to achieve a uniform dispersion rate of fuel in thesecondary air stream and a well-shaped flame.

Other variations can be made in the arrangement of parts, as will beunderstood by those skilled in the art, without departing from thespirit and scope of the invention as described in the following claims.

What is claimed is:

1. A fuel burner assembly comprising, a burner nozzle having alongitudinal axis connected to receive fuel from a source thereof andhaving an outlet to discharge the same for combustion, a source ofcombustion air under pressure, a bafile arrangement including at leastone tubular member encompassing the burner nozzle and coaxial therewitharranged to define with the nozzle an elongated annular passageway ofdiminishing circumference, said passageway extending from a largecircumference end in communication with said source of combustion air toreceive combustion air and terminating at a small circumference end incommunication with the discharge end of said burner nozzle to dischargecombustion air adjacent said burner nozzle outlet, said member beingpivotally adjustable about a point approximately located in the plane ofthe burner nozzle outlet and along the axis of This is accomplished Vthe nozzle to position the axis of said member at an angle relative tothe longitudinal axis of the burner nozzle to vary the direction of thecombustion air discharged and to control the direction of the burnerflame, and means to pivotally adjust said member.

2. A fuel burner assembly according to claim 1 wherein said burnernozzle is provided with a frusto-conical configuration the smalldiameter end of which defines the burner nozzle outlet, said tubularmember being bellshaped such that the passageway defined by the burnernozzle and said member has substantially a long radius curvature.

3. A fuel burner assembly comprising, a burner nozzle having alongitudinal axis connected to receive fuel from a source thereof andhaving an outlet to discharge the same for combustion, a source ofcombustion air under pressure, a baffle arrangement including a pair ofsubstantially coaxial tube-like baflles encompassing the burner nozzleand arranged to define an elongated surrounding passageway ofdiminishing circumference, said passageway extending from a largecircumference end in communication with said source of combustion air toreceive combustion air and terminating at a small circumference end incommunication with the discharge end of said burner nozzle to dischargecombustion air adjacent said burner nozzle outlet, the outer of saidcoaxial baflles being pivotally adjustable about a point approximatelylocated in the plane of the burner nozzle outlet and along the axis ofthe nozzle to position the axis of the outer coaxial baffle at an anglerelative to the longitudinal axis of the burner nozzle thereby varyingthe direction of the combustion air discharge and controlling thedirection of the burner flame, and means to pivotally adjust said outerbaffle.

4. A burner assembly, comprising a windbox having an inlet to receivecombustion air and having an outlet opening therein, a fuel injectornozzle having a longitudinal axis, an inlet to receive fuel and anoutlet todischarge said fuel for combustion, said nozzle being disposedwith a portion thereof extending through the outlet of said windbox andwith the outlet of said nozzle being outside of said windbox, a ringmember disposed over said nozzle and secured to said nozzle adjacent theoutlet of the latter, said ring member flaring outwardly from the pointof connection with the nozzle to a point within the outlet opening ofsaid windobx, a ring-shaped baflle disposed in superimposed spacedrelationship with said ring member and flaring outwardly from a pointadjacent the outlet of said nozzle to a point within the outlet openingof said windbox, said ring member and said battle defining therebetweenan elongated annular combustion air passageway having a long radiuscurvature extending from and communicating with the interior of saidwindbox to receive combustion air from the latter and terminatingadjacent the outlet of said nozzle to discharge combustion air aroundthe nozzle outlet, and means for pivotally moving the baflle about apoint approximately located in the plane of the injector nozzle outletand along the axis of the nozzle relative to said ring member and nozzleto obliquely position the axis of said baffle relative to the axes ofthe latter thereby varying the direction of the combustion airdischarged and controlling the direction of the burner flame.

5. A burner assembly, comprising a windbox having a combustion air inletand outlet opening, a fuel injector nozzle having a longitudinal axis,an inlet to receive fuel and an outlet to discharge said fuel forcombustion, said nozzle being disposed with a portion thereof extendingthrough the outlet of said windbox with the outlet of said nozzle beingoutside of said windbox, a bell-shaped ring member disposed over and incoaxial relationship with the injector nozzle, said bell-shaped ringmember being connected at the smaller diameter end to said nozzle at apoint adjacent the outlet of the latter and extending in a diretcionaway from the outlet of the nozzle throught the outlet opening of thewindbox to a point within the windbox, a second bell-shaped ring memberof larger dimensions than said first-mentioned ring member disposed in asubstantially coextensive superimposed coaxial relationship with saidfirst-mentioned ring member, said second bell-shaped ring memberextending from the smaller diameter end thereof from a point adjacentthe outlet of said nozzle through the inlet of said windbox to a pointwithin said windbox, means for supporting the second bell-shaped ringmember in spaced relationship to said first-mentioned bell-shaped ringmember and said nozzle whereby an elongated annular combustion airpassageway having a long radius curvature is defined between thebell-shaped ring members, said combustion air passageway communicatingwith the interior of the windbox to receive combustion air andterminating adjacent the outlet of the nozzle, and adjusting means forpivotally moving said second bell-shaped ring member about a pointapproximately located in the plme of the injector nozzle outlet andalong the axis of the nozzle relative to said first mentionedbell-shaped ring member and the nozzle to obliquely position the axis ofthe second bellshaped ring member relative to the axes of the latterthereby varying the direction of the combustion air dis charged andcontrolling the direction of the burner flame.

6. The apparatus of claim wherein the support means comprises aplurality of four equally spaced arms which are secured to the secondbell-shaped ring member and extend radially therefrom and whereinadjusting means comprises a rod for each of said arms, each rod beingconnected to the distal end portion of an arm, and each of said rodsbeing mounted for axial movement to effect tilting movement in any planeof the second bell-shaped ring member relative to said first mentionedbell-shaped ring member.

7. A pulverized fuel burner comprising a windbox having an inlet forreceiving secondary air and an outlet, a pulverized fuel injectorassembly having a longitudinal axis, an involute portion and a dischargenozzle portion, said involute portion being connected to receive amixture of primary air and pulverized fuel and connected to saiddischarge nozzle portion to pass said mixture of primary air andpulverized fuel to said nozzle for discharge, said fuel injectorassembly being disposed with the involute portion within the windbox andthe discharge nozzle projecting through the outlet of said windbox, aring member having an open end portion adapted to receive therethroughsaid discharge nozzle and an opposite open end portion of substantiallylarger dimension than said first mentioned open end portion, said ringmember being dis posed over said discharge nozzle of said pulverizedfuel injector assembly and secured at the smaller open end portion tosaid discharge nozzle adjacent the outlet thereof and with the largeropen end portion projecting into the interior of the windbox, a bafliemeans of substantially the same configuration as said ring member and oflarger dimensions than the latter being disposed in a substantiallycoextensive superimposed spaced relationship with said ring member todefine with the latter an elongated annular secondary air passageway,said baflie means and said ring member being formed so that the annularsecondary air passageway has a long radius curvature, said passagewaycommunicating at one end with the interior of said windbox to receivesecondary air therefrom and terminating at the opposite end adjacent thedischarge end of said nozzle, means for tilting said baflie about apoint approximately located in the plane of the discharge nozzle outletand along the axis of the nozzle relative to said ring member to varythe direction of the combustion air flow discharged from said airpassageway with respect to the longitudinal axis of said burner nozzleto thereby controllably vary the direction of the flame produced by thecombustion of the fuel discharged from said burner nozzle.

8. In combination with a furnace wall having a burner port therein, aburner disposed adjacent the outer surface of said furnace wallcomprising a windbox having an inlet to receive combustion air and anoutlet, a fuel injector nozzle having a longitudinal axis, an inlet toreceive fuel and an outlet to discharge fuel for combustion, said nozzlebeing disposed with a portion thereof extending through the outlet ofsaid windbox and terminating adjacent the burner port to discharge fuelinto the latter, an open-ended bell-shaped member disposed over and incoaxial realtionship with the injector nozzle, said bell-shaped memberbeing connected at the smaller diameter end to said nozzle at a pointadjacent the outlet of said nozzle, and extending in a direction awayfrom the nozzle outlet through the outlet opening of the windbox to apoint within the windbox, a second open-ended bell-shaped member oflarger dimensions than said first-mentioned bell-shaped member disposedin superimposed, coaxial relationship with said first-mentionedbell-shaped member and with the smaller diameter end portion disposed inthe burner port in sealing contact therewith but arranged for pivotalmovement relative to the axis of the burner port, said secondbell-shaped member extending from the burner port through the outlet ofsaid windbox to a point within said windbox, means for supporting saidsecond bell-shaped member in spaced relationship to said firstmentionedbell-shaped member so that an elongated annular combustion airpassageway is defined between the two bell-shaped members, the wall ofeach of said bellshaped members having a long radius curvature so thatsaid annular passageway has a long radius curvature, said passagewaycommunicating at the large circumference end with the interior of thewindbox to receive combustion air from the flatter and at the oppositesmall circumference end communicating with the burner port to dischargecombustion air therein adjacent the outlet of the injector burnernozzle, and other means for pivotally moving said second bell-shapedmember about a point approximately located in the plane of the injectornozzle outlet and along the axis of the nozzle relative to saidfirst-mentioned bell-shaped member and the injection nozzle to obliquelyposition the axis of said second member relative to the axes of thelatter thereby varying the direction of the combustion air dischargedand controlling the direction of the burner flame.

9. The apparatus of claim 8 wherein a plurality of spaced vanes aredisposed in said annular combustion air passageway to impart rotarymotion to the combustion air flowing through said air passageway.

10. The apparatus of claim 8 wherein said first-mentioned meanscomprises a plurality of spaced arms radially extending from said secondbellshaped member and said other means comprises a plurality of rodsmounted on said windbox for axial movement, tone rod connected at oneend to an arm whereby relative axial movement of said rods effectsthrough said arms movement of said second bell-shaped member relative tosaid first mentioned bell-shaped member.

11. In combination with a furnace wall having a burner port therein, apulverized fuel burner comprising a windbox having an inlet to receivesecondary air and an outlet adjacent said burner port, a burner nozzlehaving a longi- 1 l tudinal axis, an inlet to receive a mixture ofpulverized fuel and primary air and an outlet to discharge said fuel andair mixture, said burner nozzle being disposed to project through thewindbox outlet toward said burner port, a ring member disposed aroundsaid nozzle and connected to said nozzle adjacent the outlet of thelatter, said ring member extending from the point of connection with thenozzle outwardly from the nozzle and into the windbox through saidoutlet of the windbox, a ring-shaped bathe of substantially the sameconfiguration as said ring member and of larger dimensions than thelatter being disposed in superimposed spaced relationship with the ringmember and extending from a point adjacent said nozzle outlet into saidwindbox, the wall of each of said ring-shaped baffie and ring memberhaving a long radius curvature so that an elongated annular combustionair passageway hving a long radius curvature is defined between theWalls of said ring-shaped bathe and ring memher, said passageway beingin communication at the large circumference end with the interior ofsaid windbox to receive secondary air therefrom and at the oppositesmall circumference end communicating with the area adjacent the outletof said nozzle to discharge secondary air peripherally of said nozzleoutlet, and means for tilting the ring-shaped baffle about a pointapproximately located in the plane of the burner nozzle outlet and alongthe axis of the nozzle relative to said ring member to vary thedirection of the secondary air flow discharged from said annularsecondary air passageway with respect to the longitudinal axis of theburner nozzle to thereby controllably vary the direction of the flameproduced by the combustion of fuel discharged from the burner nozzle.

References Cited in the file of this patent UNITED STATES PATENTS1,052,430 Lidstone Feb. 4, 1913 1,436,823 Purnell Nov. 28, 19221,976,208 Agthe et al. Oct. 9, 1934 2,229,068 Frisch Jan. 21, 19412,395,276 Jordan Feb. 19, 1946 FOREIGN PATENTS 190,146 Great BritainJuly 19, 1923 207,242 Great Britain NOV. 19, 1923 311,905 Great BritainMay 23, 1929 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTIONPatent No, 3, 143,089 August 4, 1964 Gilbert C. Whitney, J12, et a1.

It is hereby certified that error appears in the above numbered patentrequiring correction and that the said Letters Patent shodd read ascorrected below.

In the heading to the drawings, Sheets 1 to 4, line 2 thereof, and inthe heading to the printed specification, line 2, title of invention,:for "FULL BURNER ASSEMBLY", each occurrence, read FUEL BURNER ASSEMBLYSigned and sealed thisf20th day of April 1965.

(SEAL) Attest:

ERNEST w. SWIDER' EDWARD J. BRENNER Attesting Officer Commissioner ofPatents

1. A FUEL BURNER ASSEMBLY COMPRISING, A BURNER NOZZLE HAVING ALONGITUDINAL AXIS CONNECTED TO RECEIVE FUEL FROM A SOURCE THEREOF ANDHAVING AN OUTLET TO DISCHARGE THE SAME FOR COMBUSTION, A SOURCE OFCOMBUSTION AIR UNDER PRESSURE, A BAFFLE ARRANGEMENT INCLUDING AT LEASTONE TUBULAR MEMBER ENCOMPASSING THE BURNER NOZZLE AND COAXIAL THEREWITHARRANGED TO DEFINE WITH THE NOZZLE AN ELONGATED ANNULAR PASSAGEWAY OFDIMINISHING CIRCUMFERENCE, SAID PASSAGEWAY EXTENDING FROM A LARGECIRCUMFERENCE END IN COMMUNICATION WITH SAID SOURCE OF COMBUSTION AIR TORECEIVE COMBUSTION AIR AND TERMINATING AT A SMALL CIRCUMFERENCE END INCOMMUNICATION WITH THE DISCHARGE END OF SAID BURNER NOZZLE TO DISCHARGECOMBUSTION AIR ADJACENT SAID BURNER NOZZLE OUTLET, SAID MEMBER BEINGPIVOTALLY ADJUSTABLE ABOUT A POINT APPROXIMATELY LOCATED IN THE PLANE OFTHE BURNER NOZZLE OUTLET AND ALONG THE AXIS OF THE NOZZLE TO POSITIONTHE AXIS OF SAID MEMBER AT AN ANGLE RELATIVE TO THE LONGITUDINAL AXIS OFTHE BURNER NOZZLE TO VARY THE DIRECTION OF THE COMBUSTION AIR DISCHARGEDAND